All Terrestrial planets are separated into layers of different densities
a. True
b. False
Indicate whether the statement is true or false
True
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A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?
A) It goes down. B) It does not change. C) It goes up. D) This cannot be determined without knowing the volume of the top piece of wood.
A circus diver drops from a high pole into water far below. When he is halfway down
A) his potential energy is halved. B) he has gained an amount of kinetic energy equal to half his initial potential energy. C) his kinetic energy and potential energy are equal. D) all of the above E) none of the above
During a star's main sequence portion of its life it does not change size appreciably. This observation indicates that
A. the Sun produces about the same amount of energy as it radiates into space. B. the Sun produces less energy than it radiates into space. C. the Sun produces more energy than it radiates into space.
Uranus completes an orbit around the Sun every 84 years and spins once every 17 hours, approximately. Which of the following could be observed from the planet Uranus?
A. one sunrise every 17 hours on the equator B. nights lasting several years near the pole tipped away from the Sun C. days lasting several years near the pole tipped toward the Sun D. season cycle of 84 years near the poles E. All of these choices are correct.